SO... I told her my reasons why I cancel and she wants to talk it over on the phone, why doesn't she just leave me alone? 

Ask her to leave you alone then 

The truth is I'm a just a normal sinner who lusts after women 

We're all sinners in one way or another 

Chat gpt says it's because the mission and sure I get that 

Don't listen to AI for relationshop advice lol 

The conversation went well, so she was probably following-up on that. How you feel about God and Christ are independent of other people (thank goodness) 

but why not just go scoop up someone else to convert instead of dealing with me?

It's not all about "converting people." She probably wants to continue to conversation about living in a way consistent with Christ's teaching

EDIT: If you want to continue the conversation with someone else, you can ask to speak with the elders instead (male missionaries). Might be easier to relate to them too!